Re: OT GM 700R4 Tranny problem

Posted by jdemaris on March 03, 2007 at 06:47:30 from (69.67.231.121):

In Reply to: Re: OT GM 700R4 Tranny problem posted by Rick Kr on March 02, 2007 at 19:20:34:

RE: Rick KR and "The 700R4 is not a TH350 with an OD"

I didn't mean that GM simply took a 350 and slapped an extra gear in it. What I meant is - the 700R4 uses clutchs with same torque-rating as the 350 - the 700R4 was designed as an equivalent to the TH350 in power-handling capabilities but with and OD and lockup-converter.
Same goes for the TH400 (a.k.a. 3L80) and subsequent 4L80E.
In regard to the TH400 variants -
The original TH400 used a varible-pitch torque-converter that was dropped after 1967.
The TH375 used less clutch disks than the standard TH400 and a smaller OD output shaft. Also used a special extension housing so its total length was the same as a TH350.
The TH475 was used in heavy trucks, motor homes, school busses etc. and used straight-cut gears in the planetaries instead of helical gears like the standard TH400.
I suspect the max. torque ratings are -
For the TH350 and 700R4 - 350 lb. ft.
For the TH400 - 400 lb. ft. ,
the TH475 - 475 lb.ft.
I've never found any GM specs that show specific max. ratings for the automatics - but it is listed for all the manual transmssions. GM does state that the newer metric designation of "60", "65", "80", etc. designate the max. torque rating - but in what way, I do not know. Seems the metric "60" equals around 350 lb. ft.

Replies:

• Re: OT GM 700R4 Tranny problem Allan In NE 08:35:34 03/03/07 (1)
  • Nope - the switch-pitch TH400 exists jdemaris 06:06:31 03/04/07 (0)

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